Materials Literature
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Abstract A semiconductor/metal hybrid system with silicon as base material and embedded metal nanostructures is fabricated in two steps by anodizing the silicon substrate in an aqueous hydrofluoric acid solution and a subsequent electrodeposition process. The achieved self‐assembled nanoscopic hybrid system consists o…
Abstract Dislocations in large hen egg‐white lysozyme (HEWL) crystals with tetragonal and orthorhombic forms were investigated by means of synchrotron monochromatic‐beam X‐ray topography. For the tetragonal form, not only screw dislocations but also edge ones are found to be included in predominant ones parallel to 〈1…
Resistance noise spectroscopy is applied to bulk single crystals of the quasi-two-dimensional organic conductor $\ensuremath{\kappa}\text{\ensuremath{-}}{(\text{BEDT-TTF})}_{2}\text{Cu}[\text{N}{(\text{CN})}_{2}]\text{Cl}$ both under moderate-pressure and at ambient-pressure conditions. When pressurized, the system ca…
Nanocrystalline silicon microwires are self-heated through single, large amplitude, and microsecond voltage pulses. Scanning electron micrographs show very smooth wire surfaces after the voltage pulse compared to as-fabricated nanocrystalline texture. Voltage-pulse induced self-heating leads to significant conductance…
Through density functional theory calculations, we demonstrate that enhancement of optical absorption and optimization of the fundamental band gap for Cu delafossites can be achieved through alloying group IIIA and IIIB delafossites. These alloys significantly improved the flexibility in designing delafossite-based ph…
The match between the calculated TD-DFT electronic circular dichroism spectrum of the M,M configuration of the lemniscular [36]octaphyrin 1 and the previously reported measured spectrum suggests that the assignment of the latter to the P,P enantiomer requires inverting to M,M. The unusually large magnitude of the calc…
We report experimental results on tuning ultraviolet (UV) emissions of colloidal ZnO quantum dots (QDs) with uniform size in poly(methyl methacrylate) (PMMA) through controlling their dispersion. Instead of using organic ligands, exfoliated nanoplatelets were utilized as an inorganic dispersant to achieve controlled a…
$\ensuremath{\alpha}$-quartz-type ${\text{Si}}_{1\ensuremath{-}x}{\text{Ge}}_{x}{\text{O}}_{2}$ solid solutions ($x=0.06$, 0.11, and 0.24) and pure ${\text{SiO}}_{2}$ were investigated by Raman spectroscopy. Coupled and decoupled vibrational modes were identified at room temperature as a function of composition. Tetra…
Abstract Small‐angle X‐ray scattering (SAXS) has become a standard tool for the investigation of nano‐structured materials with applications in many fields of science. Scanning tomography adds three‐dimensional information to the method. We investigate the validity of the tomographic model in SAXS tomography. We ident…
Using a microscopic theory based on excluded-volume interactions, we analyze the structure and thermodynamic stability of configurations in a two-dimensional liquid crystal confined into a (small) circular nanocavity. Weak homeotropic anchoring conditions are considered, and topological defects of total charge k=+1 ar…
Tunnel magnetoresistance (TMR) effect was investigated in Co2MnSi/CoFeB(0–2 nm)/MgO/CoFe magnetic tunnel junctions (MTJs). TMR ratio was enhanced by inserting a thin CoFeB layer at the Co2MnSi/MgO interface. The MTJ with CoFeB thickness of 0.5 nm exhibited the highest TMR ratio. From the conductance-voltage measuremen…
New highly electrical conductive nanocomposites were prepared by dispersing nickel nanowires into a poly(vinylidene difluoride)-trifluoroethylene P(VDF-TrFE) matrix. A suspension of individual nickel nanowires with a regular high aspect ratio (ξ ≈ 250) was elaborated. The nickel nanowires were fabricated by electrodep…
Surfactant-POM (polyoxometalate) phases are fascinating in both their self-assembly behavior and their utility as catalysts, probes, and photochromic, electrochromic, and magnetic devices. Well-ordered lamellar phases are formed when the surfactant:POM ratio is 4:1 or 2:1, and these have been described in great detail…
Metal nanoparticle assemblies of well-defined structure are investigated as substrates for quantitative surface enhanced Raman scattering (SERS). The ∼100 nm structures are composed of oligonucleotide-functionalized gold nanoparticles of two sizes; a large particle serves as a template for assembly of multiple small p…
Some archaea of the Euryarchaeota present a unique version of the Embden-Meyerhof pathway where glucose and fructose-6-phosphate are phoshporylated using ADP instead of ATP as the phosphoryl donor. These are the only ADP-dependent kinases known to date. Although initially they were believed to represent a new protein…
Water-soluble biocompatible rhamnose-coated Fe(3)O(4) nanoparticles of 4.0 nm are obtained by covalent anchorage of rhamnose on the nanoparticles surface via a phosphate linker. These nanoparticles present superparamagnetic behavior and nuclear relaxivities in the same order of magnitude as Endorem that make them pote…
Future integration of metal-insulator-metal capacitors requires devices with high capacitance density and low quadratic voltage coefficient of capacitance (α). A major problem is that the increase in capacitance density is usually accompanied by increased voltage nonlinearities. By combining two high-k materials with…
We present a study of the adsorption of single molecules of volatiles, such as water, ethanol, ethyl acetate, pyridine, toluene, and n-octane, on the dry surface of a smectite clay using a series of calculations based on density functional theory. Our clay model contains both tetrahedral and octahedral substitutions,…
We report an experimental study of the temporal and spatial dynamics of shock waves, cavitation bubbles, and sound waves generated in water during laser shock processing by single Nd:YAG laser pulses of nanosecond duration. A fast ICCD camera (2 ns gate time) was employed to record false schlieren photographs, schlier…
Form follows mechanism: The nanoscale morphology of W/Mo oxides can be controlled through alkali chlorides as inorganic additives that shape the particles in a versatile and efficient manner. The mechanistic pathways leading to the different morphologies are investigated by in situ energy-dispersive X-ray diffraction…